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http://dx.doi.org/10.4150/KPMI.2013.20.1.013

The Effect of Mn Addition on Nitrogenation Behavior and Magnetic Properties of Sm-Fe Alloy Powder Produced by Reduction-diffusion Method  

Seo, Young-Taek (Powder/Ceramics Division, Korea Institute of Materials Science)
Baek, Youn-Kyoung (Powder/Ceramics Division, Korea Institute of Materials Science)
Lee, Jung-Goo (Powder/Ceramics Division, Korea Institute of Materials Science)
Choi, Chul-Jin (Powder/Ceramics Division, Korea Institute of Materials Science)
Publication Information
Journal of Powder Materials / v.20, no.1, 2013 , pp. 13-18 More about this Journal
Abstract
In the present study, we systematically investigated the effect of Mn addition on nitrogenation behavior and magnetic properties of Sm-Fe powders produced by reduction-diffusion process. Alloy powders with only $Sm_2(Fe,Mn)_{17}$ single phase were successfully produced by the reduction-diffusion process. The coercivity of $Sm_2(Fe,Mn)_{17}$ powder rapidly increased during nitrogenation and reached the maximum of 637 Oe after 16 hours. After further nitrogenation, it decreased. In contrast, the coercivity of $Sm_2Fe_{17}$ powder gradually increased during nitrogenation for 24 hours. The coercivity of $Sm_2(Fe,Mn)_{17}$ powder was higher than that of $Sm_2Fe_{17}$ powder at the same condition of nitrogenation. It was considered that the Mn addition facilitates the nitrogenation of $Sm_2Fe_{17}$ powder and enhances the coercivity.
Keywords
Reduction-diffusion method; $Sm_2Fe_{17}$; Nitrogenation; Mn;
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